you can direct the blow by out to the environment, it has to go somewhere, if it was plugged-up the pressure will build up and cause the engine to either shut off (in the case of the 123's and 126's w/ a vacuum shut off valve, or the pressure could blow seals and cause engine damage.
If the blow by is normal its just burned along with fuel I wouldn't worry about it.
OTOH the EGR is something to defeat, for experimental purposes of course
If the valve cover is distorted it won't seal effectively (there is always a little oil that gets by the seal it seems) maybe yours is bent? Don't overtorque the hold down nuts.